Assigning multiple IPs in the same network to an interface

M. V. bored_to_death85 at yahoo.com
Thu Feb 16 07:21:41 UTC 2012


hi everybody,

i have a problem with setting multiple IPs in the same network in FreeBSD:

- suppose I assign two new IP addresses in the same network to eth0 with ifconfig:
#ifconfig eth0 add 192.168.10.1/24
#ifconfig eth0 add 192.168.10.2/24

- everything works fine and the output of "netstat -r" is like what it should be:
#netstat -r
....
192.168.10.0   eth0
192.168.10.1    lo0
192.168.10.2    lo0
...

- but now if I delete first IP address, connection to 192.168.10.0 network will be gone. and in output of "netstat -r" the route to 192.168.10.0 (via eth0) is gone:
#ifconfig eth0 delete 192.168.10.1

#netstat -r
....

192.168.10.2    lo0
.....

- am i missing something here? shouldn't the route to the network remain in routing table (because we still have 192.168.10.2 assigned to interface)?

Thanks.


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